Argentina, I'll always hold it in my memory as my number one destination, particularly loved Buenos Aires and the Iguazu Falls, truly amazing and awesome.
I've also loved the many places we've visited in the US, Canada, Mexico, Australia....sadly never made it to NZ that was an ambition once, but of late I've come to hate flying so it's probably off the agenda even though we have very close friends in Auckland and told them we would visit, but have met up with them several times in mainland Europe they miss the ancient world, so that seemed somewhat easier.
Mainland Europe most of it but particularly love Italy, real Spain as in the parts that haven't been ruined, France. I'd like to see a bit more of Scandinavia have only been to Denmark.
Sometimes I'm just grateful for the places I have seen. I love the thought of the destination, it's the logistics of getting there that increasingly puts me off.